1. Focus on making the company profitable by cutting down on staff and resources. Seriously, Twitter doesn't need thousands of employees, a large HQ and all that other fancy stuff. I think a team of about 30 people could probably run it fine.
2. Get developers on board again. Open up API access, stop shutting down/blocking projects, etc. Make people feel like they could start a business on Twitter's platform, without the rug being pulled out down the line.
3. Get rid of the Trust and Safety Council. It's currently a bunch of left wingers that don't care much for freedom of speech, which groups like the ACLU suspiciously absent.
4. Improve moderation. Kick out terrorists and nutcases on the 'left', stop looking for every excuse to ban right wing users and generally treat everyone with respect all around.
5. Try and make the Android app more usable. Because at the moment, it's really awkward to use and gets rather slow at times.
6. Stop using verification and unverification as a punishment. Really, it's like Twitter is being as confusing as possible here.
7. Have the timeline set to how it used to be. Remove the 'show best tweets first' crap from any accounts unfortunate enough to still have it enabled.
8. Make things like URLs not count towards the character limit. I think Gab already does this, and it's very useful.